Table 2.
Reference | Random sequence generation | Allocation concealment | Blinding of participants, personnel, and outcome assessors | Incomplete outcome data | Selective outcome reporting | Other sources of bias |
---|---|---|---|---|---|---|
Helli et al. [33] | L | L | L | L | L | L |
Farajbakhsh et al. [31] | L | H | L | L | L | L |
Da Silva Barbosa et al. [30] | L | H | L | L | L | L |
Mohammad Shahi al. [35] | L | H | L | L | L | L |
Haghighian et al. [32] | L | H | H | L | L | L |
Karatzi et al. [34] | L | H | H | L | L | L |
Wu et al. [24] | L | L | L | L | L | L |
1H: high risk of bias; L: low risk of bias; and U: unclear risk of bias.